Ala. Code § 41-10-44.10
Any project obligations issued by the authority may from time to time be refunded by the issuance, by sale or exchange, of refunding bonds or obligations payable from the same or different sources for the purpose of paying all or any part of the principal of the project obligations to be refunded, any redemption premium required to be paid as a condition to the redemption prior to maturity of any such project obligations that are to be so redeemed in connection with such refunding, any accrued and unpaid interest on the project obligations to be refunded, any interest to accrue on each project obligation to be refunded to the date on which it is to be paid, whether at maturity or by redemption prior to maturity, and the expenses incurred in connection with refunding; provided, that unless duly called for redemption pursuant to provisions contained therein, the holders of any such project obligations then outstanding and proposed to be refunded shall not be compelled without their consent to surrender their outstanding project obligations for such refunding. Any refunding bonds or obligations may be sold by the authority at public or private sale at such price or prices as may be determined by the board of directors to be most advantageous, or may be exchanged for the project obligations to be refunded. Any such refunding bonds or obligations may be executed and delivered by the authority at any time and from time to time, shall be in such form and denominations and have such tenor and maturities, shall contain such provisions not inconsistent with the provisions of this article, and shall bear such rate or rates of interest, payable and evidenced in such manner, as may be provided by resolution of the board of directors.
Any refunding bonds or obligations issued by the authority shall be issued and secured in accordance with the provisions of Section 41-10-44.5; provided, however, that no refunding bonds shall be issued unless the present value of all debt service on the refunding bonds (computed with a discount rate equal to the true interest rate of the refunding bonds and taking into account all underwriting discount and other issuance expenses) shall not be greater than 95 percent of the present value of all debt service on the bonds to be refunded (computed using the same discount rate and taking into account the underwriting discount and other issuance expenses originally applicable to such bonds) determined as if such bonds to be refunded were paid and retired in accordance with the schedule of maturities (considering mandatory redemption as a scheduled maturity) provided at the time of their issuance. Provided further that the average maturity of the refunding bonds, as measured from the date of issuance of such refunding bonds, shall not exceed by more than three years the average maturity of the bonds to be refunded, as also measured from such date of issuance, with the average maturity of any principal amount of bonds to be determined by multiplying the principal of each maturity by the number of years (including any fractional part of a year) intervening between such date of issuance and each such maturity, taking the sum of all such products, and then dividing such sum by the aggregate principal amount of bonds for which the average maturity is to be determined.
Ala. Code § 41-10-44.10 (1975)